A comparison of zircon U-Pb age results of the Red Clay sequence on the central Chinese Loess Plateau
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Abstract:
Abstract Single grain zircon U-Pb geochronology has demonstrated great potentials in extracting tectonic and atmospheric circulation signal carried by aeolian, fluvial, and fluviolacustrine sediments. A routine in this sort of studies is analyzing 100–150 grains and then compares zircon U-Pb age spectra between the measured sample and the potential sources. Here we compared the zircon U-Pb age results of the late Miocene-Pliocene Red Clay sequence of two neighboring sites from the Chinese Loess Plateau where similar provenance signal is expected. Although the results from the 5.5 Ma sediment support this prediction, the results from the 3 Ma sediment at these two sites differ from each other significantly. These results emphasize the importance of increasing analysis number per sample and combining the zircon U-Pb geochronology with other provenance tools in order to get reliable provenance information.Keywords:
Geochronology
Loess plateau
Loess and eolian sand cover vast areas of the western Great Plains of Nebraska, Kansas and Colorado (Fig. 1). In recent studies of Quaternary climate change, there has been a renewed interest in loess and eolian sand. Much of the attention now given to loess stems from new studies of long loess sequences that contain detailed records of Quaternary glacial-interglacial cycles, thought to be a terrestrial equivalent to the foraminiferal oxygen isotope record in deep-sea sediments (Fig. 2). Loess is also a direct record of atmospheric circulation, and identification of loess paleowinds in the geologic record can test atmospheric...
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A Review of the Study on the Origin of Xiashu Loess in the Middle and Lower Reaches of Yangtze River
Main resultes of the researches on the origin of Xiashu Loess since 1930s are reviewed in order to further recognize the origin of Xiashu Loess and its significance for the environmental evolution in the eastern part of China. The contents discussed and reviewed mainly include the aeolian origin, the water-transporting origin and multiple origins of Xiashu Loess. To sum up, the origin of Xiashu Loess is complicated, mainly includes the aeolian origin, the water-transporting origin, and remnant and slope accumulating origin. However, in terms of the sequence and importance of the transporting forces, aeolian origin is first. In order to get a correct result when using the environmental information containing in Xiashu loess to derive environmental changes in the eastern part of China , the study section of Xiashu Loess should be selected carefully.
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